A 2024 US penny (which is a mixture of zinc and copper) is dissolved in dilute nitric acid, forming — Stoichiometry Chemistry Question
Question
A 2024 US penny (which is a mixture of zinc and copper) is dissolved in dilute nitric acid, forming aqueous Cu2+ and Zn2+ ions. The resulting solution is treated with an excess of iodide ion, causing the Cu2+ to react to form CuI(s) and I3-(aq). Subsequent titration with thiosulfate reveals that 4.93 × 10^-4 mol of I3-(aq) was formed. What is the mass of copper in the penny?
A.
31.3 mg
B.✓ Correct
62.7 mg
C.
125 mg
D.
188 mg
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